Google Play Music has just received a notable update to add a few features that have been bugging users for some time now. Right off the top you'll spot a proper reverse button on the music widget, letting you go backwards in albums or playlists without entering the app. Instant mixes can now continue on past 25 tracks as well, and you can shuffle albums, artists or playlists. The default album art is changed to a simpler grey tile also.
When you pin albums or tracks, you can now see the progress of the download from that album or playlist view rather than just in the settings. There is also apparently a bugfix that should solve the problem of some Galaxy SIII (S3) devices freezing when using the app. It's a whole bunch of useful fixes and improvements, so go grab the update from the Play Store now.